* This adds namespace lookup to serializer_for
* address rubocop issue
* address @bf4's feedback
* add docs
* update docs, add more tests
* apparently rails master doesn't have before filter
* try to address serializer cache issue between tests
* update cache for serializer lookup to include namespace in the key, and fix the tests for explicit namespace
* update docs, and use better cache key creation method
* update docs [ci skip]
* update docs [ci skip]
* add to changelog [ci skip]
